Added systemd resolver files to Ubuntu16.04 and RHEL7

This change adds the systemd resolver file to the `copy_from_host`
include list. This will ensure that all of the resolver information
on a given host is also present within a container.

Change-Id: I8cb6635f0021c65cf8245ca346c5effcd759115d
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

vars/redhat-7.yml

@@ -46,6 +46,7 @@ lxc_cache_map:
     - /etc/yum.repos.d/
     - /etc/pki/rpm-gpg/
     - /etc/resolv.conf
+    - /etc/systemd/resolved.conf
   cache_prep_commands: |
     yum install -y {{ lxc_cache_packages | join(' ') }}
     rm -f /usr/bin/python

vars/ubuntu-16.04.yml

@@ -50,6 +50,7 @@ lxc_cache_map:
     - /run/resolvconf/
     - /etc/resolvconf/
     - /etc/resolv.conf
+    - /etc/systemd/resolved.conf
     - /root/repo.keys
   cache_prep_commands: |
     apt-key add /root/repo.keys